is a pinkish mauve to rose red variety of Muscovite that
is named in
1853 by T. S. Hunt for Dr. James Wilson
of Perth, Ontario, Canada, who discovered the material at Bathurst
Township, Lanark County, Ontario, Canada. Wilsonite is an aluminosilicate
of magnesium and potassium and almost identical in composition, hardness
and density to Gieseckite
and very similar to Alurgite,
also varieties of Muscovite, although
Wilsonite has distinct cleavage form and crystal habits. Wilsonite
may be pseudomorphous after Nepheline or Cordierite
or possibly an altered Scapolite. Wilsonite
cabochon gems are uncommon and beautiful with mauve
to rose red colors.
is another variety of Muscovite that
is reddish-purple and gets its color from the presence of manganese in its
chemical formula. A green variety of Muscovite
also exists that is called Fuchsite and is colored by the
presence of chromium.
In Canada: Bathurst Township, Lanark County, Ontario
and Rémigny, Témiscamingue RCM, Abitibi-Témiscamingue, Québec, Canada.